Materials&Installation:Durable ABS Plastic ,The extruded aluminum crossbars feel aircraft-grade; if you need installation instruction ,please contact us ,we will send you electronic
Load Performance: Successfully carried 3 kayaks (total 68kg) for 300+ miles with no bending - Meets its 220 lbs rating when properly distributed
Aerodynamic Impact: Added 3-4dB of wind noise at 65mph (measured with Decibel X app) and reduced EV's range by 5% at highway speeds
Long-Term Reliability: After 8 months and 5,000 miles through four seasons, all hardware remains rust-free thanks to the zinc plating, though the rubber seals are beginning to dry-crack